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    <meta charset="UTF-8">
    <title>02_基础标签</title>
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    <b>加粗</b>
    <i>斜体</i>
    <u>下划线</u>
    <s>删除线文字</s>
    <mark>高亮标记文字</mark>
    <h1>11111</h1>
    我是，我喜欢&nbsp;&nbsp;学习
    <br>
    我是&lt;我&gt;,我也一样
    <h1>一级标题</h1>
    <h2>二级标题</h2>
    <h3>三级标题</h3>
    <h4>四级标题</h4>
    <h5>五级标题</h5>
    <h6>六级标题</h6>
    <p>这是一个段落</p>
    <p>这是一个段落</p>
    <p>lorem ipsum dolor sit amet, consectetur adipisicing elit. Accusamus aliquid animi asperiores atque beatae blanditiis consequatur consequuntur cum cumque delectus dicta distinctio dolorem doloribus ducimus ea earum eligendi enim eos esse est et eum exercitationem expedita fuga fugiat fugit</p>
    <ol type="1">
        <li>开门</li>
        <li>关门</li>
    </ol>
    <ul type="none">
        <li>开门1</li>
        <li>关门2</li>
        <li>开门3</li>
    </ul>
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